Reporting: Add histograms.

net/reporting/reporting_report.h

Index: net/reporting/reporting_report.h
diff --git a/net/reporting/reporting_report.h b/net/reporting/reporting_report.h
index b1b310171f99491fb171d82e4134bee5455516a4..61ed07436693c1f9312ad2695daa7625b5640231 100644
--- a/net/reporting/reporting_report.h
+++ b/net/reporting/reporting_report.h
@@ -21,6 +21,23 @@ namespace net {
 // An undelivered report.
 struct NET_EXPORT ReportingReport {
  public:
+  // Used in histograms; please add new items at end and do not reorder.
+  enum class Outcome {
+    UNKNOWN = 0,
+    DISCARDED_INVALID_TYPE_FROM_RENDERER = 1,
+    DISCARDED_NO_URL_REQUEST_CONTEXT = 2,
+    DISCARDED_NO_REPORTING_SERVICE = 3,
+    ERASED_FAILED = 4,
+    ERASED_EXPIRED = 5,
+    ERASED_EVICTED = 6,
+    ERASED_NETWORK_CHANGED = 7,
+    ERASED_BROWSING_DATA_REMOVED = 8,
+    ERASED_REPORTING_SHUT_DOWN = 9,
+    DELIVERED = 10,
+
+    MAX
+  };
+
   ReportingReport(const GURL& url,
                   const std::string& group,
                   const std::string& type,
@@ -29,6 +46,12 @@ struct NET_EXPORT ReportingReport {
                   int attempts);
   ~ReportingReport();
 
+  static void RecordReportDiscardedForInvalidTypeFromRenderer();
+  static void RecordReportDiscardedForNoURLRequestContext();
+  static void RecordReportDiscardedForNoReportingService();
+
+  void RecordOutcome(base::TimeTicks now);
+
   // The URL of the document that triggered the report. (Included in the
   // delivered report.)
   GURL url;
@@ -51,7 +74,11 @@ struct NET_EXPORT ReportingReport {
   // attempt. (Not included in the delivered report.)
   int attempts = 0;
 
+  Outcome outcome;
+
  private:
+  bool recorded_outcome;
+
   DISALLOW_COPY_AND_ASSIGN(ReportingReport);
 };